S. Syadat Jamian; M. Aghaalikhani; A. Mokhtassi-Bidgoli
Abstract
To investigate the effect of planting density on quantitative and qualitative characteristics of globe artichoke (Cynara cardunculus L. var. Scolymus (L.) Fiori) under weedy and weed-free conditions, a field experiment was conducted at Tarbiat Modares University, Tehran in 2016 growing season. A factorial ...
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To investigate the effect of planting density on quantitative and qualitative characteristics of globe artichoke (Cynara cardunculus L. var. Scolymus (L.) Fiori) under weedy and weed-free conditions, a field experiment was conducted at Tarbiat Modares University, Tehran in 2016 growing season. A factorial arrangement of the experimental treatments was studied in a randomized complete block design with three replications. The factors included four crop planting densities (2, 4, 6 and 8 plants m-2) under two conditions of presence and absence of weeds. Different traits including leaf number per plant, leaf area index, total dry weight, chlorophylls a, b and total chlorophyll, caffeic acid, chlorogenic acid and total polyphenol contents were measured. The results showed that leaf number and dry weight were significantly affected by plant density and weed competition in artichoke, so that the weed competition reduced the artichoke dry weight by 22.4%. The highest leaf area index (2.29) and dry weight of artichoke (253.44 g m-2) were observed at 6 plants m-2, while the highest number of leaves per plant (16.33) belonged to the density of 2 plants m-2. Among qualitative traits chlorophylls a, b and total chlorophyll were only affected by weed presence while caffeic acid, chlorogenic acid and total polyphenol contents were only affected by plant density. The effect of crop plant density on weed leaf area and dry weight was also significant. Overall, the highest performance of the main secondary metabolites in artichoke including caffeic acid, chlorogenic acid and total polyphenol (5.99, 9.55 and 5.89 g m-2, respectively) were obtained at 6 plants m-2, completely affected by crop dry matter yield.
S.A. Kermani Poorbaghaiy; M. Pouryousef; Kh Jamshidi; M.R. Azimi
Abstract
To evaluate the effect of stem pruning and plant density on yield and yield components of pumpkin, a factorial experiment based on randomized complete blocks design with three replications was carried out at the Research Field of University of Zanjan in spring 2011. In this study, plant density in three ...
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To evaluate the effect of stem pruning and plant density on yield and yield components of pumpkin, a factorial experiment based on randomized complete blocks design with three replications was carried out at the Research Field of University of Zanjan in spring 2011. In this study, plant density in three levels including 8000, 12000, 16000 plant/ha and stem pruning in three levels including no stem pruning and stem pruning after 14 and 18 nodes formation were investigated. Results showed that stem pruning had significant (p ≤ 0.05) effects on all traits except number of seed per fruit. The highest fruit yield (142.2 ton/ha) and seed yield (3219 kg/ha) were obtained at pruning of stem after formation of 14 nods and the lowest fruit yield (112 ton/ha) and seed yield (2775 kg/ha) were obtained at no stem pruning treatment. Also, results showed that the plant density had significant effect (p ≤ 0.01) on fruit and seed yield. The highest fruit yield (157.4 ton/ha) and seed yield (3754 kg/ha) was obtained in 16000 plant/ha and the lowest fruit yield (93.5 ton/ha) and seed yield (2170.8 kg/ha) were obtained in 8000 plant/ha. Interaction effect of stem pruning and plant density on measured traits was not significant.
